To get out of SP wiggle ur fingers and toes, the other questions are hard.

1) The fact is u do forget the world, you are so taken up in ur inner consciousness, I can imagine training yourself to hang on to that information.

2) Eye movement will take u out of SP/not allow u to get into it.

3) If u focus on ur real body in a dream u will wake up, again with training u could do it to small degrees.